Ignition-generator



W. W. DEAN.

lGNlTlON GENERATOR. APPLICATION FILED AuG.22, me.

. Patented Aug. 30, 1921 UNITED STATES PATENT. OFFICE.

WILLIAM wmmr DEAN, or STAMFORD, connnc'rrcu'r, ASSIGNOR TO srm'rnomnmc'rmom oomrm, or NEWARK, NEW JERSEY, A. conronm'ron' or NE JERSEY.

IGNITION-GENERATOR.

To all whom it may concern Be it known that I, WILLIAM W. DEAN, acitizen of the United States, residing at Stamford, in the county ofFairfield and State of Connecticut, have invented certain new and usefulImprovements in Ignition- Generators, of which the following is aspecification, reference being had to the accompanying drawing.

The invention relates tors used for'ignition or the like and generallytermed magnetos, and in detail to 'a magneto having a stationary currentgenerating coil and a permanent magnet rotating between the pole piecesconnected to the core of said coil.

An object of the invention is to provide a magneto of the above typewith pole pieces which may be shifted relative to the fixed pole piecesconnected to the core of the coil for timing purposes.

A further object of the invention is to provide a magneto of the abovetype with means for short circuiting the poles of the magnet which arenot furnishing flux to the shiftable pole pieces.

. These and other objects will in part be obvious and will in part behereinafter more fully disclosed. v

In the drawings which show by way of illustration, one embodiment of theinvention:-

Figure 1 is a vertical sectional view through a magneto having myimprovements; and

Fig. 2 is a sectional view on the line 2--2 of Fig. 1.

The invention, asshown in the drawings, is embodied in a magneto forignition purposes which consists of a permanent magnet mounted on asuitable shaft adapted to rotate in suitable bearings This magnet formsthe rotor of the magneto. Associated with the rotor is a stationarycurrent generating coil. Extending through the generating coil is a corehaving pole pieces connected thereto, which pole piecesare .dis-

posed relative to the permanent magnet so" as to receive flux therefrom.This rotating magnet is provided with a plurality of alternately N and Spoles and the pole pieces are so disposed as to receive flux fromadjacent poles of the magnet. These features are broadly shown anddescribed and broadly to genera- Specification of Letters Patent. IPatented Aug, 30, 1921 Application filed. August 22, 19 16. Serial N0.116,359.

claimed in my co-pending application, Se-

which is so disposed as to short circuit the poles ofthe rotor""whichare remote from the pole pieces. Referring more in detail to the drawmgI I have shown the invention embodied in a magneto having side plates 1and 2 which are formed with-bearings 3 and 4 for a shaft 5 which isrotated by any suitable means. Clamped between the upper parts of theside plates 1 and 2 is a core 6 carrying a current generating coil 7 ofthe usual construction.

ttached to the core 6 are pole pieces 8 and 9 having curved faces 10 and11 respectively. Mounted on the shaft 5 is a permanent magnet 12. Thismagnet is secured to the shaft by asuitable key 13. The magnet 12 isprovided with four poles 14, 15,16 and 17, the outer faces of which arecurved as at 18 about the axis of theshaft as a center. I

degrees apart and the pole pieces 10 and 11 are similarly disposed sothat'they receive flux from adjacent poles of the magnet.

Freely mounted on shaft 5 are two nonmagnetic. plates 19 and 20. Betweenthese plates and outside of the magnet there are sections 21, 22 and 23of magnetic material and also sections 24:, 25 and 26 'of non-magneticmaterial. Suitable screws 27 pass through these side plates 19 and 20into these sections and 'secure the same together, thus forming asleeve, which is freely shiftable about the shaft 5 as a center. hesection 26 is provided with a handle 28 which may be connected to thetiming mechanism. The sections 21 and 22 of magnetic material are curvedtoconform to the faces of the 4 pole pieces and also to the outer facesof the poles of the magnet and are disposed betweenthese faces asclearly shown in Fig. 1

which receive the flux from the poles of the magnet as the flux passesto the fixed pole pieces 10 and 11 and the core of the currentgenerating coil. This sleeve with the shiftable pole pieces is shiftedin the well known that the presence of this magnetic section.

23 does not effect the magnetism in said pole pieces. This magneticsection for short circuiting certain of the poles of the magnet isshown, described and claimed broadly in m co-pending application SerialNo. 113,117, filed August 4th, 1916.

It is obvious that minor changes in the details of'construction may bemade without departing from the spirit of the invention as set forth inthe appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is v 1. An ignition magneto comprising astationary current generating coil, a core therefor, fixed pole piecesfor said core, a rotating permanent magnet having a plurality of likepoles, said pole pieces being so disposed relative to the magnet as toreceive flux from adjacent poles of said magnet and shiftable polepieces between the fixed poles and the poles of the magnet furnishingflux thereto,

and a magnetic section so disposed relative to the rotating magnet as toshort circuit the other poles of said magnet.

2. An ignition magneto comprising a stationary current generatin coil, acore therefor, fixed pole pieces for said core, a rotating permanentmagnet having a plurality of like poles, said pole pieces being sodisposed relative to the magnet as to receive flux from adjacent polesof said magnet and shiftable pole pieces between the fixed poles and thepoles of the magnet furnishing flux thereto, a magnetic section sodisposed relative to the rotating magnet as to short circircuit theother poles of said magnet, said magnetic section being shiftable withthe pole pieces.

r n ignition magneto comprising a stationary current generatlng coil, acore therefor, fixed pfole pieces for said core, a four pole permanentmagnet having alternate N and S poles, said pole pieces being sodisposed as to receive flux from the adjacent poles of the magnet andshiftable pole pieces disposed between the fixed poles and the poles ofthe magnet furnishing flux thereto, and a magnetic section so disposedrelative to the magnet as to short circuit the poles which are remotefrom said shiftable pole pieces.

4. An ignition magneto comprising a stationary current generating coil,a core therefor, fixed pole pieces for said core, a four pole permanentmagnet having alternate N and poles, said pole piecesbeing so disposedas to receive flux from the adjacent poles ofthe magnet and shiftablepole pieces disposed between the fixed poles and the poles of the magnetfurnishing flux thereto, and a magnetic section so disposed relative tothe magnet as to short circuit the poles which are remote from saidshiftable pole pieces, said magnetic section being connected to andmovable with said shiftable pole pieces.

5. An ignition magneto comprising a stationary current generating coil,a core therefor, fixed pole pieces forsaid core, a rotating permanentmagnet having a plurality of like poles, said pole pieces being sodisposed as to receive flux from adjacent poles of the magnet, a shaftcarrying said magnet, nonmagnetic side plates freely journaled on saidshaft, shiftable pole'pieces disposed between the fixed pole pieces andthe poles of the magnet, means for connecting said shiftable pole piecesto saidside plates, a magnetic section connected with said side platesand so disposed as to short circuit the poles of the magnet remote fromsaid shiftable pole pieces.

6. An ignition magneto comprising a stationary current generating coil,a core therefor, fixed pole pieces for said core, a rotating permanentmagnet having a plurality of like poles, said pole pieces being sodisposed as to receive flux from adjacent poles of the magnet, a shaftcarrying said magnet, nonmagnetic side plates freely j ournaled on saidshaft, shiftable pole pieces disposed between the fixed pole pieces andthe poles of the magnet, means for connecting said shiftable pole piecesto said side plates, a magnetic section connected with said side platesand so disposed as to short circuit the poles of the magnet remote fromsaid shiftable pole pieces, and non-magnetic sections carried by theside plates and separating said last named magnetic section from theshiftable pole pieces.

In testimony whereof I hereunto afiix my signature in the presence oftwo Witnesses.

VVILLIIAM WVARREN DEAN.

